WO2013187092A1 - Circuit hydraulique de machine de construction et dispositif de commande associé - Google Patents

Circuit hydraulique de machine de construction et dispositif de commande associé Download PDF

Info

Publication number
WO2013187092A1
WO2013187092A1 PCT/JP2013/056195 JP2013056195W WO2013187092A1 WO 2013187092 A1 WO2013187092 A1 WO 2013187092A1 JP 2013056195 W JP2013056195 W JP 2013056195W WO 2013187092 A1 WO2013187092 A1 WO 2013187092A1
Authority
WO
WIPO (PCT)
Prior art keywords
control valve
construction machine
passage
hydraulic circuit
bleed
Prior art date
Application number
PCT/JP2013/056195
Other languages
English (en)
Japanese (ja)
Inventor
浩文 橋本
Original Assignee
住友建機株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友建機株式会社 filed Critical 住友建機株式会社
Priority to CN201380020040.6A priority Critical patent/CN104220763B/zh
Priority to EP13803591.0A priority patent/EP2863065B1/fr
Priority to KR1020147028304A priority patent/KR101681248B1/ko
Publication of WO2013187092A1 publication Critical patent/WO2013187092A1/fr
Priority to US14/538,920 priority patent/US9932994B2/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
    • F15B11/10—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor in which the servomotor position is a function of the pressure also pressure regulators as operating means for such systems, the device itself may be a position indicating system
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2221—Control of flow rate; Load sensing arrangements
    • E02F9/2239—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance
    • E02F9/2242—Control of flow rate; Load sensing arrangements using two or more pumps with cross-assistance including an electronic controller
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2264—Arrangements or adaptations of elements for hydraulic drives
    • E02F9/2267—Valves or distributors
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2282—Systems using center bypass type changeover valves
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2292—Systems with two or more pumps
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2296—Systems with a variable displacement pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
    • F15B11/161—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load
    • F15B11/162—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors with sensing of servomotor demand or load for giving priority to particular servomotors or users
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F15B13/0402—Valve members; Fluid interconnections therefor for linearly sliding valves, e.g. spool valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/205—Systems with pumps
    • F15B2211/20576—Systems with pumps with multiple pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3052—Shuttle valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30525—Directional control valves, e.g. 4/3-directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/31—Directional control characterised by the positions of the valve element
    • F15B2211/3105—Neutral or centre positions
    • F15B2211/3116—Neutral or centre positions the pump port being open in the centre position, e.g. so-called open centre
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31576—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having a single pressure source and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/315—Directional control characterised by the connections of the valve or valves in the circuit
    • F15B2211/3157—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line
    • F15B2211/31582—Directional control characterised by the connections of the valve or valves in the circuit being connected to a pressure source, an output member and a return line having multiple pressure sources and a single output member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/35—Directional control combined with flow control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40507—Flow control characterised by the type of flow control means or valve with constant throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41509—Flow control characterised by the connections of the flow control means in the circuit being connected to a pressure source and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/415—Flow control characterised by the connections of the flow control means in the circuit
    • F15B2211/41554—Flow control characterised by the connections of the flow control means in the circuit being connected to a return line and a directional control valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/45—Control of bleed-off flow, e.g. control of bypass flow to the return line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7135—Combinations of output members of different types, e.g. single-acting cylinders with rotary motors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7142—Multiple output members, e.g. multiple hydraulic motors or cylinders the output members being arranged in multiple groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/78—Control of multiple output members
    • F15B2211/781—Control of multiple output members one or more output members having priority

Definitions

  • the present invention relates to a hydraulic circuit of a construction machine and a control device thereof.
  • Some construction machines perform control (bleed-off control) for returning a part (for example, surplus) of pressure oil discharged from a hydraulic pump to a hydraulic oil tank.
  • control bleed-off control
  • some construction machines have a clearance (bleed opening) for returning pressure oil in the spool of the direction control valve.
  • the construction machine performs bleed-off control by changing the opening area of the bleed opening (for example, Patent Document 1).
  • a spool of a directional control valve Vm is provided with a plurality of bleed openings Sbo. At this time, the hydraulic circuit performs bleed-off control by changing the opening area of the bleed opening Sbo.
  • Patent Document 1 Japanese Patent Laid-Open No. 11-257302
  • an embodiment of the present invention is a hydraulic circuit of a construction machine or a control device thereof, which includes a center bypass passage to which pressure oil discharged from a hydraulic pump is supplied and performs bleed-off control. It is an object of the present invention to provide a hydraulic circuit of a construction machine or a control device thereof that can reduce pressure loss of pressure oil passing through a bypass passage.
  • a hydraulic circuit for a construction machine including a plurality of directional control valves arranged in tandem in a center bypass passage of the construction machine, and the directional control valve group.
  • a bleed-off valve disposed in the downstream center bypass passage and a control valve for controlling the amount of pressure oil supplied to the directional control valve, the directional control valve being supplied to the directional control valve
  • a first internal passage for allowing pressure oil to flow into the center bypass passage; and a second internal passage for supplying the pressure oil to a hydraulic actuator of the construction machine, wherein the first internal passage is the hydraulic pump
  • the pressure oil discharged from the directional control valve is caused to flow into the center bypass passage downstream of the direction control valve, so that the center bypass passage and the first internal passage are connected in parallel.
  • a passage Forming a passage, and the bleed-off valve performs bleed-off control of pressure oil supplied through the parallel passage by changing an opening area of the bleed-off valve, and the control valve
  • a hydraulic circuit for a construction machine that controls the amount of pressure oil supplied to the second internal passage by changing the opening.
  • the pressure loss of the pressure oil passing through the center bypass passage can be reduced.
  • FIG. 1 is a schematic external view illustrating an example of a construction machine according to an embodiment of the present invention. It is a hydraulic circuit diagram explaining an example of the hydraulic circuit of the construction machine which concerns on embodiment of this invention. It is a hydraulic circuit diagram explaining the other example of the hydraulic circuit of a construction machine. It is a schematic block diagram explaining an example of the direction control valve and control valve of the hydraulic circuit which concerns on the Example of this invention. It is a schematic sectional drawing explaining an example of the cross section (AA cross section of FIG. 4) of the direction control valve of the hydraulic circuit which concerns on the Example of this invention. It is a schematic block diagram explaining the other example of the direction control valve of a hydraulic circuit. It is a schematic sectional drawing explaining an example of the cross section (BB cross section of FIG. 6) of the other example of the direction control valve of a hydraulic circuit.
  • this invention is a construction machine provided with a center bypass passage (center bypass line) other than this embodiment, and tanks a part of pressure oil using a cut valve (bleed-off valve, flow control valve, etc.). As long as it is refluxed (bleed-off control), any of them can be used.
  • Construction machines that can use the present invention include hydraulic excavators, crane cars, bulldozers, wheel loaders and dump trucks, pile driving machines, pile removers, water jets, mud drainage treatment equipment, grout mixers, depth machines. Includes foundation and drilling machines.
  • Construction machine configuration A schematic configuration of a construction machine 100 in which the present invention can be used will be described with reference to FIG.
  • the construction machine is a machine that performs a desired operation using a hydraulic actuator in the present embodiment.
  • the construction machine 100 includes, as hydraulic actuators, a boom 11 whose base end is pivotally supported on the upper swing body 10Up, an arm 12 pivotally supported on the distal end of the boom 11, and a distal end of the arm 12. And a bucket 13 that is pivotally supported.
  • the construction machine 100 extends and contracts the boom cylinder 11c in the longitudinal direction by supplying hydraulic oil to the boom cylinder 11c disposed in the gap between the boom 11 and the upper swing body 10Up. At this time, the boom 11 is driven in the vertical direction by expansion and contraction of the boom cylinder 11c.
  • the construction machine 100 is controlled by a boom direction control valve (for example, Vb1 and Vb2 in FIG. 2 (described later)) that is controlled according to an operation amount (and an operation direction) of an operation lever of an operator (operator, operator).
  • the hydraulic oil supplied to the boom cylinder 11c is controlled.
  • the construction machine 100 performs a desired operation according to the operation amount of the operation lever of the operator.
  • the construction machine 100 drives the arm 12 and the bucket 13 by the expansion and contraction of the arm cylinder 12c and the bucket cylinder 13c as in the case of the boom 11.
  • the construction machine 100 uses an arm direction control valve (for example, Va1 and Va2 in FIG. 2) and a bucket direction control valve (for example, Vbk in FIG. 2) to form an arm cylinder 12c and a bucket cylinder 13c.
  • the hydraulic fluid supplied to the is controlled.
  • the construction machine 100 travels (moves back and forth, left and right) and rotates (turns, etc.) the main body of the construction machine 100 using wheels and a turning device.
  • the construction machine 100 uses, for example, a traveling direction control valve (for example, Vt1, Vt2, and Vst in FIG. 2) to run the construction machine 100 according to the amount of operation of the operation lever of the operator.
  • a traveling direction control valve for example, Vt1, Vt2, and Vst in FIG. 2
  • a construction machine 100 that can use the present invention includes a hydraulic circuit (described later) 20 that supplies hydraulic oil (pressure oil) from a hydraulic pump to a hydraulic actuator, and a control device (described later) that controls the operation of each component of the construction machine 100. 30).
  • the hydraulic circuit 20 of the construction machine 100 will be described with reference to FIG.
  • the solid line described in FIG. 2 indicates an oil passage (pressure oil passage).
  • a solid line added with // indicates an electric control system.
  • the hydraulic circuit to which the present invention can be applied is not limited to that shown in FIG. That is, the present invention can be applied to any hydraulic circuit as long as it is provided with a center bypass passage and a cut valve is arranged in the center bypass passage on the downstream side of the direction control valve.
  • the hydraulic circuit to which the present invention can be applied is not limited to one having two hydraulic pumps. That is, you may use this invention for a hydraulic circuit (construction machine) provided with 1 or 3 or more hydraulic pumps.
  • the hydraulic circuit 20 of the construction machine 100 includes two hydraulic pumps mechanically connected to an output shaft of a power source (a prime mover, an engine, a motor, etc.) not shown.
  • P first hydraulic pump P1 and second hydraulic pump P2
  • two center bypass passages RC first hydraulic pump supplied with pressure oil (operating oil) respectively discharged from the two hydraulic pumps P
  • a direction control valve such as the first traveling direction control valve Vt1 that controls the hydraulic actuator (such as the boom 11 in FIG. 1)
  • a control valve (straight-running valve) Vst.
  • the hydraulic circuit 20 includes a bleed-off valve Vbo (a first bleed-off valve Vbo1 and a second bleed-off valve Vbo2) disposed downstream (for example, the most downstream) of the center bypass passage RC. Further, the hydraulic circuit 20 generates a pressure to be input to the pilot port (control port) of the bleed-off valve Vbo (discharges the pressure oil) pilot pump Pp (first pilot pump Pp1 and second pilot pump Pp2).
  • a bleed-off valve Vbo a first bleed-off valve Vbo1 and a second bleed-off valve Vbo2 disposed downstream (for example, the most downstream) of the center bypass passage RC. Further, the hydraulic circuit 20 generates a pressure to be input to the pilot port (control port) of the bleed-off valve Vbo (discharges the pressure oil) pilot pump Pp (first pilot pump Pp1 and second pilot pump Pp2).
  • a directional control valve (Vt1 or the like) is arranged in series with the center bypass passage RC, and a bleed-off valve Vbo is arranged downstream of the center bypass passage RC.
  • the hydraulic circuit 20 includes a first traveling direction control valve (for example, a left traveling direction control valve) Vt1 and a preliminary direction in a first center bypass passage RC1 corresponding to the first hydraulic pump P1.
  • the control valve Vop, the turning direction control valve Vsw, the second boom direction control valve Vb2, the first arm direction control valve Va1, and the first bleed-off valve Vbo1 are arranged in series.
  • the hydraulic circuit 20 includes a second traveling direction control valve (for example, a right traveling direction control valve) Vt2 and a bucket direction control valve Vbk in the second center bypass passage RC2 corresponding to the second hydraulic pump P2.
  • the first boom direction control valve Vb1, the second arm direction control valve Va2, and the second bleed-off valve Vbo2 are arranged in series.
  • the hydraulic circuit 20 has a straight running valve Vst disposed upstream of the second center bypass passage RC2.
  • the hydraulic circuit 20 has a plurality of directional control valves arranged in series in the center bypass passage RC. Further, the hydraulic circuit 20 arranges the directional control valves in tandem by arranging a plurality of directional control valves in series in the two center bypass passages RC1, RC2.
  • a group composed of a plurality of directional control valves arranged in tandem in the center bypass passage RC is referred to as a “directional control valve group”.
  • the hydraulic circuit 20 further includes a control valve (throttle valve, flow rate control valve, etc.) Vth for controlling the flow rate of pressure oil supplied to a second internal passage RV2 (described later) of the directional control valve.
  • the hydraulic circuit 20 can arrange
  • the hydraulic circuit 20 has a remote control pressure (secondary pressure of the remote control valve) generated according to operation information (for example, information about the operation amount, information about the operation direction) corresponding to the operation of the operator's operation lever. Is input to the directional control valve (Vt1, etc.) corresponding to the operated operating lever. At this time, the direction control valve switches the position of the spool in accordance with the remote control pressure introduced at both ends of the spool (flow rate control spool), and the flow rate (operation amount) and direction (operation direction) of the pressure oil (hydraulic oil) To control.
  • operation information for example, information about the operation amount, information about the operation direction
  • operation information for example, information about the operation amount, information about the operation direction
  • the direction control valve switches the position of the spool in accordance with the remote control pressure introduced at both ends of the spool (flow rate control spool), and the flow rate (operation amount) and direction (operation direction) of the pressure oil (hydraulic oil) To control.
  • the hydraulic circuit 20 uses the bleed-off valve Vbo (for example, Vbo1) disposed downstream of the center bypass passage RC (for example, RC1), and the pressure oil discharged from the hydraulic pump P (for example, P1). Part (surplus) of the oil is returned to the hydraulic oil tank Tnk (bleed-off control is performed). Accordingly, the construction machine 100 can control the flow rate of the hydraulic oil (pressure oil) supplied to the hydraulic cylinder (for example, 11c), and can control the drive (operation) of the hydraulic actuator (for example, 11 in FIG. 1). .
  • Vbo for example, Vbo1
  • the bleed-off valve Vbo includes an unload position where the opening area is maximized and a block position where the opening area is zero.
  • the bleed-off valve Vbo is switched from the unload position to the block position using the pressure oil of the pilot pump Pp controlled by the control device 30 described later, and its opening area is changed. Accordingly, the bleed-off valve Vbo can return (return) the pressure oil having a desired flow rate corresponding to the changed opening area to the hydraulic oil tank.
  • the hydraulic circuit 20 includes a directional control valve group (a plurality of directional control valves). Further, the directional control valve according to the present embodiment has, as the internal passage RV, a first internal passage that flows the supplied pressure oil to the center bypass passage RC, and a second that supplies the supplied pressure oil to the hydraulic actuator. And an internal passage. That is, the plurality of directional control valves constituting the directional control valve group are each provided with a first internal passage and a second internal passage.
  • the first internal passage causes the pressure oil discharged from the hydraulic pump to flow out to the center bypass passage RC downstream of the direction control valve, whereby a parallel passage is formed by the center bypass passage RC and the first internal passage.
  • a parallel passage is formed by the center bypass passage RC and the first internal passage.
  • the shape of the internal passage of the direction control valve (the shape of the spool) or the like may be the shape of an embodiment (FIG. 4) described later.
  • the first internal passage is an internal passage (for example, RV1 in FIG. 2) for supplying pressure oil to the bleed-off valve Vbo.
  • the first internal passage flows the pressure oil discharged from the hydraulic pump P connected upstream of the center bypass passage RC to the center bypass passage RC downstream of the direction control valve (Va1 and the like).
  • the opening of the first internal passage is not fully closed even when the spool position of the directional control valve is switched. That is, in the present embodiment, the first internal passage has substantially the same passage area regardless of the spool position of the direction control valve. Note that substantially the same passage area means that the effective passage area through which the pressure oil actually passes does not change substantially compared to the increase / decrease amount of the passage area that changes due to the displacement of the spool position.
  • the hydraulic circuit 20 according to the embodiment of the present invention can form a parallel passage by the center bypass passage RC and the first internal passage. Further, the hydraulic circuit 20 according to the embodiment of the present invention can form a parallel passage corresponding to the passage area of the first internal passage. Furthermore, the hydraulic circuit 20 according to the embodiment of the present invention can supply pressure oil to the directional control valve group (a plurality of directional control valves) only from the formed parallel passage.
  • the traveling direction control valves (for example, Vt1 and Vt2 in FIG. 2) among the plurality of direction control valves may have a configuration in which the opening of the first internal passage is fully closed (for example, RV1t in FIG. 2).
  • the construction machine 100 (the hydraulic circuit 20 thereof) can ensure traveling stability (flow rate of hydraulic oil necessary for traveling) during traveling.
  • the first internal passage (spool) of the directional control valve according to the present embodiment does not include a gap (hereinafter referred to as “bleed opening”) for returning the pressure oil to the hydraulic oil tank.
  • bleed opening a gap
  • the hydraulic circuit 20 according to the present embodiment can perform bleed-off control (unified bleed-off control) using the bleed-off valve Vbo disposed on the most downstream side of the center bypass passage RC. .
  • the second internal passage according to the embodiment of the present invention is an internal passage (for example, RV2 in FIG. 2) for supplying pressure oil to a hydraulic cylinder (for example, the arm cylinder 12c in FIG. 2).
  • the second internal passage supplies pressure oil discharged from the hydraulic pump P to a hydraulic cylinder (such as the arm cylinder 12c in FIG. 2).
  • the second internal passage according to the present embodiment changes the path of the internal passage and supplies the hydraulic oil (hydraulic oil) supplied to the hydraulic cylinder. ) Is changed in flow rate (operation amount) and direction (operation direction).
  • the direction control valve construction machine 100
  • the flow rate of the supplied pressure oil is controlled by the control valve Vth arranged upstream of the direction control valve (second internal passage) in the second internal passage. That is, the hydraulic circuit 20 controls the amount of pressure oil supplied to the second internal passage by controlling the opening degree of the control valve Vth.
  • the hydraulic circuit 20 (construction machine 100) controls the operation of the hydraulic cylinder (hydraulic actuator) to which the pressure oil (hydraulic oil) is supplied by controlling the amount of the pressure oil supplied to the second internal passage. Can be controlled.
  • Fig. 3 shows another example of the hydraulic circuit of a construction machine.
  • bleed openings for example, Sbo of FIG. 6
  • Va1 of FIG. 3, etc. the construction machine including the hydraulic circuit of FIG. 3 can perform bleed-off control by changing the opening area of the bleed opening.
  • the pressure loss of the pressure oil passing through the directional control valve may occur. That is, in the construction machine provided with the hydraulic circuit of FIG. 3, even when the opening degree of the bleed opening of the direction control valve is the upper limit, the opening degree of the internal passage of the direction control valve is designed to be narrowed. Compared with the case of the hydraulic circuit according to (FIG. 2), the pressure loss of the pressure oil passing through the center bypass passage may increase.
  • the directional control valve of the hydraulic circuit of FIG. 3 since the bleed opening is provided in the spool of the directional control valve, the length of the directional control valve in the longitudinal direction increases. That is, in the directional control valve of the hydraulic circuit of FIG. 3, since the bleed opening is provided in the spool of the directional control valve, the directional control valve becomes larger than the hydraulic circuit according to the present invention (FIG. 2). , Making it uneasy.
  • the controller 30 of the construction machine 100 uses a controller 30C (FIG. 2) that is mounted to control the operation of the entire construction machine 100.
  • the controller 30 ⁇ / b> C is a device that instructs each component of the construction machine 100 to operate and controls the operation of each component.
  • the controller 30C (control device 30) can be configured by an arithmetic processing device including a CPU (Central Processing Unit), a memory, and the like.
  • the controller 30C controls the operation of the regulator R (R1, R2) based on information input to the construction machine 100 (for example, operation information regarding the operation amount and operation direction of the operation lever).
  • the discharge amount of the hydraulic pump P (P1, P2) is controlled by the regulator R.
  • the controller 30C generates a remote control pressure using a remote control valve or the like based on information input to the construction machine 100.
  • the controller 30C inputs the generated remote control pressure to the direction control valve (Vt1 etc.) using the remote control circuit.
  • the direction control valve can switch the spool position and control the hydraulic oil supplied to the hydraulic actuator by using the input remote control pressure.
  • the controller 30C controls the opening degree of the control valve Vth based on information input to the construction machine 100.
  • the controller 30C may control the opening degree of the control valve Vth according to, for example, a predetermined operation situation.
  • the controller 30C can control the flow rate of the pressure oil supplied to the second internal passage of the direction control valve V using the control valve Vth. Further, the controller 30C improves the operability during complex operation (for example, simultaneously operating a plurality of hydraulic actuators) by controlling (adjusting) the opening degree of the control valve Vth corresponding to the arbitrary direction control valve V. Can be made. For example, in the combined operation, the controller 30C increases the opening degree of the control valve Vth corresponding to the hydraulic actuator that prioritizes the operation and decreases the opening degree of the control valve Vth corresponding to the hydraulic actuator that does not prioritize the operation. The operability during the combined operation can be improved.
  • the controller 30C may control the opening of the control valve Vth by changing the pressure input to the control valve Vth (control port thereof) based on the information input to the construction machine 100. Further, the controller 30C may detect the discharge pressure of the hydraulic pump, the pressure of hydraulic oil of the hydraulic actuator, or other operation status of the construction machine, and may control the opening degree of the control valve Vth based on the detected result. .
  • the controller 30C changes the pressure oil pressure of the pilot pump Pp (Pp1, Pp2) input to the bleed-off valves Vbo (Vbo1, Vbo2) based on the information input to the construction machine 100.
  • the bleed-off valve Vbo can change the opening degree using the input pressure.
  • the bleed-off valve Vbo can control the flow rate of the pressure oil that returns to the hydraulic oil tank by changing the opening degree.
  • controller 30C can reduce the pressure loss of the pressure oil passing through the center bypass passage RC during the single operation using the bleed-off valve Vbo, and at the time of combined operation (for example, so-called floor digging work)
  • the operability of the construction machine can be improved by adjusting (increasing or decreasing) the opening degree of the control valve Vth corresponding to any hydraulic actuator (arm 12 and bucket 13 in FIG. 1).
  • the bleed-off control is not performed by the directional control valve, and the first internal passage of the directional control valve is used. Since the pressure oil discharged from the hydraulic pump P can be supplied downstream of the center bypass passage RC, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
  • the bleed-off control is performed by the directional control valve using the bleed-off valve Vbo disposed downstream of the center bypass passage RC. Without the bleed opening in each directional control valve, the bleed-off control can be performed downstream of the center bypass passage RC.
  • the internal passage (for example, the first internal passage) of the directional control valve is compared with the case where the bleed-off control is performed by the plurality of directional control valves. ), The pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
  • the directional control valve since the directional control valve is not provided with the bleed opening, the size of the directional control valve in the longitudinal direction can be reduced. it can.
  • the direction control valve can be reduced in size compared to the case where the direction control valve is provided with a bleed opening, and the manufacture thereof is facilitated. can do.
  • the opening degree of the control valve Vth corresponding to an arbitrary hydraulic actuator is adjusted (larger or smaller) during the combined operation. Can do.
  • the hydraulic circuit 20 which concerns on this embodiment, or its control apparatus 30, while using the bleed-off valve Vbo, while being able to reduce the pressure loss of the pressure oil which passes the center bypass passage RC at the time of single operation,
  • the operability of the construction machine 100 can be improved by adjusting the opening of the control valve Vth corresponding to an arbitrary hydraulic actuator during the combined operation.
  • the configuration and the like of the construction machine 100E according to the present example are basically the same as the configuration and the like of the construction machine 100 of the embodiment, and thus description thereof is omitted.
  • FIG. 4 shows a schematic configuration diagram of the directional control valve V and the control valve Vth arranged in the hydraulic circuit 20 of the construction machine 100E according to the present embodiment.
  • FIG. 4A shows a case where the control valve Vth is closed (for example, a position of Vth1 in FIG. 2).
  • FIG. 4B shows a case where the control valve Vth is open (for example, a position of Vth1 in FIG. 2).
  • FIG. 4C shows a case where the control valve Vth is throttled (for example, the b position of Vth1 in FIG. 2).
  • the directional control valve V of the hydraulic circuit 20 is supplied from the inlet port PIprt supplied with pressure oil via the center bypass passage RC and the inlet port PIprt.
  • Outlet port POprt for flowing the pressurized oil into the center bypass passage RC
  • cylinder port Cprt for supplying the pressure oil supplied to the directional control valve V to the hydraulic cylinder, and hydraulic oil discharged from the hydraulic cylinder for the hydraulic oil tank
  • a tank port Tprt for discharging to the tank.
  • the control valve (throttle valve, flow rate control valve, etc.) Vth is disposed at the inlet of a path for supplying pressure oil to the second internal passage RV2.
  • the directional control valve V controls the pressure oil (hydraulic oil) Oc supplied from the center bypass passage RC when the spool is displaced (for example, Mb in the figure).
  • a hydraulic cylinder (for example, 11c in FIGS. 1 and 2) is supplied from the cylinder port CprtB through the valve Vth and the second internal passage RV2.
  • the pressure oil (hydraulic oil) Ot discharged from the hydraulic cylinder to the cylinder port CprtA is discharged from the tank port Tprt to the hydraulic oil tank.
  • the direction control valve V (hydraulic circuit 20) according to the present embodiment controls the flow rate of the pressure oil supplied to the second internal passage RV2 using the control valve Vth.
  • the control valve Vth uses the switch mechanism Sw that can fix the poppet Ppt at a predetermined position, and the pressure oil supplied to the second internal passage RV2 when the switch mechanism Sw is turned on. The flow rate can be controlled (squeezed).
  • FIG. 4B shows the poppet Ppt when the switch mechanism Sw is off.
  • the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention does not perform bleed-off control with the directional control valve V (because the directional control valve V does not have a bleed opening).
  • the opening area of the first internal passage RV1 of the direction control valve V can be increased.
  • the directional control valve V according to the present embodiment can increase the opening area of the first internal passage RV1 of the directional control valve V, thereby reducing the pressure loss of the pressure oil passing through the center bypass passage RC. can do.
  • the hydraulic circuit 20 of the construction machine 100E arranges a plurality of directional control valves V in series with the center bypass passage RC, whereby the center bypass passage RC and the plurality of first internal passages RV1 (directions).
  • the passage formed by the control valve V) can function as a parallel passage.
  • the hydraulic circuit 20 according to the present embodiment does not need to provide a separate parallel passage, and can reduce the size of the direction control valve V (reducing the size of the spool in the axial direction and the radial direction).
  • the hydraulic circuit 20 according to the present embodiment can reduce the size of the bridge passage Rb (FIG. 4A), for example.
  • the hydraulic circuit 20 of the construction machine 100E flows the pressure oil into the center bypass passage RC using the direction control valve group Gv.
  • the hydraulic circuit 20 in which the directional control valve group Gv (a plurality of directional control valves V) is arranged has the same passage area regardless of the spool position of the directional control valve.
  • a parallel passage can be formed by one internal passage and the center bypass passage RC.
  • the hydraulic circuit 20 flows out the pressure oil Op supplied from the inlet port PIprt to the outlet port POprt via the first internal passage RV1 of the direction control valve V, and flows out to the center bypass passage RC.
  • the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention does not need to provide a plurality of bleed openings in the spools of the plurality of directional control valves V (directional control valve group Gv).
  • the shape of RC can be simplified.
  • the hydraulic circuit 20 according to the present embodiment can reduce the bent portion of the center bypass passage RC, the pressure loss of the pressure oil passing through the center bypass passage RC can be reduced.
  • Control device for construction machinery The configuration and operation of the control device 30 of the construction machine 100E according to the present embodiment are basically the same as the configuration and the like of the control device 30 of the construction machine 100 of the embodiment, and thus different parts will be mainly described.
  • the control device 30 controls the control valve Vth (the opening degree) based on the information input to the construction machine 100E. Thereby, the control device 30 can control the amount of pressure oil supplied to the second internal passage RV2 (cylinder port Cprt) of the direction control valve V.
  • the control device 30 can perform the following control, for example. Note that the control operation of the control device 30 is not limited to the control exemplified below.
  • the control device 30 increases the opening degree of the control valve Vth corresponding to the hydraulic actuator that prioritizes the operation during, for example, a combined operation (FIG. 4B), and corresponds to the hydraulic actuator that does not prioritize the operation.
  • the opening degree of Vth can be reduced (FIG. 4C).
  • the control device 30 reduces the opening of the control valve Vth or sets the opening to zero. can do.
  • the control valve Vth can fix the position of the poppet Ppt at a position where the opening is reduced, for example, using the switch mechanism Sw (FIG. 4).
  • the control apparatus 30 construction machine 100E
  • the control device 30 for example, the sum of the opening degree of the control valve Vth and the opening degree of the direction control valve V (the spool thereof) (for example, the total opening area) is a conventional circuit (for example, the direction control valve Vm in FIG. 6) And the opening degree of the direction control valve V (spool thereof) can be made as large as possible.
  • the control apparatus 30 construction machine 100E
  • the control apparatus 30 can reduce the pressure loss of the pressure oil when passing the direction control valve V compared with the conventional circuit.
  • the control device 30 can detect, for example, the operation status of the construction machine 100E and control the opening degree of the control valve Vth based on the detected operation status. As a result, both low loss (during single operation) and improvement in operability (due to flow distribution during combined operation) can be achieved.
  • the control device 30 may, for example, as the operation status, discharge pressure (discharge amount) of the hydraulic pump, hydraulic oil pressure (pressure fluctuation) or hydraulic oil temperature, hydraulic oil temperature, hydraulic cylinder thrust (acceleration), hydraulic actuator pressure, You may detect combining suitably the information regarding speed, acceleration, or an angle (position), or the other state of a construction machine.
  • the hydraulic circuit 20 of the construction machine 100E or the control device 30 thereof by arranging the plurality of directional control valves V in series in the center bypass passage RC, A passage formed by one internal passage RV1 (direction control valve V) can function as a parallel passage. Furthermore, according to the hydraulic circuit 20 or the control device 30 according to the present embodiment, the passage formed by the center bypass passage RC and the plurality of first internal passages RV1 can function as a parallel passage. There is no need to provide a separate passage, and the direction control valve V can be reduced in size. Thereby, the hydraulic circuit 20 of the construction machine 100E according to the embodiment of the present invention or the control device 30 thereof has an advantageous effect on downsizing, facilitating manufacture, and cost reduction of the entire construction machine 100E.
  • control valve Vth (the opening degree thereof) can be controlled.
  • the amount of pressure oil supplied to the passage RV2 (cylinder port Cprt) can be controlled.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Operation Control Of Excavators (AREA)

Abstract

La présente invention concerne un circuit hydraulique de machine de construction présentant un groupe de distributeurs comprenant une pluralité de distributeurs positionnés en tandem dans un conduit de dérivation central de la machine de construction, une vanne de purge positionnée dans le conduit de dérivation central en aval du groupe de distributeurs, et une vanne de régulation permettant de réguler la quantité d'huile hydraulique fournie aux distributeurs : les distributeurs sont équipés d'un premier conduit interne permettant d'évacuer, vers le conduit de dérivation central, l'huile hydraulique fournie aux distributeurs, et un second conduit interne permettant de fournir l'huile hydraulique à un actionneur hydraulique dans la machine de construction ; le premier conduit interne évacue, vers le conduit d'évacuation central en aval des distributeurs, l'huile hydraulique évacuée d'une pompe hydraulique, entraînant la formation de conduits parallèles qui sont le conduit de dérivation central et le premier conduit interne ; la vanne de purge régule la purge de l'huile hydraulique qui est fournie à travers les conduits parallèles, en modifiant la surface de l'ouverture de la vanne de purge ; et la vanne de régulation régule la quantité d'huile hydraulique fournie au second conduit interne, en modifiant l'orifice de la vanne de régulation.
PCT/JP2013/056195 2012-06-15 2013-03-06 Circuit hydraulique de machine de construction et dispositif de commande associé WO2013187092A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CN201380020040.6A CN104220763B (zh) 2012-06-15 2013-03-06 施工机械的液压回路及其控制装置
EP13803591.0A EP2863065B1 (fr) 2012-06-15 2013-03-06 Circuit hydraulique de machine de construction et dispositif de commande associé
KR1020147028304A KR101681248B1 (ko) 2012-06-15 2013-03-06 건설기계의 유압회로 및 그 제어장치
US14/538,920 US9932994B2 (en) 2012-06-15 2014-11-12 Hydraulic circuit for construction machine and control device therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012136352A JP5778086B2 (ja) 2012-06-15 2012-06-15 建設機械の油圧回路及びその制御装置
JP2012-136352 2012-06-15

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US14/538,920 Continuation US9932994B2 (en) 2012-06-15 2014-11-12 Hydraulic circuit for construction machine and control device therefor

Publications (1)

Publication Number Publication Date
WO2013187092A1 true WO2013187092A1 (fr) 2013-12-19

Family

ID=49757933

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2013/056195 WO2013187092A1 (fr) 2012-06-15 2013-03-06 Circuit hydraulique de machine de construction et dispositif de commande associé

Country Status (6)

Country Link
US (1) US9932994B2 (fr)
EP (1) EP2863065B1 (fr)
JP (1) JP5778086B2 (fr)
KR (1) KR101681248B1 (fr)
CN (1) CN104220763B (fr)
WO (1) WO2013187092A1 (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101763284B1 (ko) * 2013-07-24 2017-07-31 볼보 컨스트럭션 이큅먼트 에이비 건설기계용 유압회로
JP6190763B2 (ja) * 2014-06-05 2017-08-30 日立建機株式会社 ハイブリッド式建設機械
JP6514522B2 (ja) * 2015-02-24 2019-05-15 川崎重工業株式会社 アンロード弁および油圧ショベルの油圧駆動システム
JP6463649B2 (ja) * 2015-03-13 2019-02-06 川崎重工業株式会社 建設機械の油圧駆動システム
US10851811B2 (en) * 2015-09-10 2020-12-01 Festo Se & Co. Kg Fluid system and process valve
JP6304273B2 (ja) * 2016-02-05 2018-04-04 コベルコ建機株式会社 作業機械の油圧駆動装置
JP6643913B2 (ja) * 2016-02-16 2020-02-12 株式会社クボタ 油圧ブロック
EP3434910B1 (fr) * 2016-03-22 2024-02-28 Sumitomo (S.H.I.) Construction Machinery Co., Ltd. Pelleteuse et soupape de commande pour pelleteuse
EP3225583B1 (fr) * 2016-03-31 2019-02-13 Cargotec Research & Development Ireland Limited Soupape hydraulique en sections et chariot élévateur à fourche monté sur camion incorporant une telle soupape
WO2018021288A1 (fr) 2016-07-29 2018-02-01 住友建機株式会社 Excavatrice et soupape de commande pour excavatrice
JP2018135926A (ja) * 2017-02-21 2018-08-30 川崎重工業株式会社 油圧システム
CN110382786B (zh) 2017-03-06 2021-10-15 斗山英维高株式会社 工程机械的控制系统及工程机械的控制方法
CN107725507A (zh) * 2017-11-22 2018-02-23 江苏恒立液压科技有限公司 液压控制系统的控制方法
JP6703585B2 (ja) * 2018-11-01 2020-06-03 Ｋｙｂ株式会社 流体圧制御装置
JP7198072B2 (ja) 2018-12-13 2022-12-28 キャタピラー エス エー アール エル 建設機械の油圧制御回路
JP7208701B2 (ja) 2018-12-13 2023-01-19 キャタピラー エス エー アール エル 建設機械の油圧制御回路
JP7221101B2 (ja) 2019-03-20 2023-02-13 日立建機株式会社 油圧ショベル
IT201900007737A1 (it) * 2019-05-31 2020-12-01 Walvoil Spa Valvola oleodinamica con movimento prioritario in azionamenti simultanei
JP7365101B2 (ja) 2020-03-12 2023-10-19 キャタピラー エス エー アール エル 建設機械の油圧制御回路

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11257302A (ja) 1998-03-06 1999-09-21 Toshiba Mach Co Ltd 多連油圧バルブ
JPH11303809A (ja) * 1998-04-20 1999-11-02 Komatsu Ltd 油圧駆動機械のポンプ制御装置
JP2000046015A (ja) * 1998-07-28 2000-02-15 Yutani Heavy Ind Ltd 油圧回路の自己診断装置
JP2007192344A (ja) * 2006-01-20 2007-08-02 Kobelco Contstruction Machinery Ltd 作業機械の油圧制御装置

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2138986C3 (de) * 1971-08-04 1978-09-07 G.L. Rexroth Gmbh, 8770 Lohr Steuerventileinrichtung für mehrere hydraulische Antriebe
US4186771A (en) * 1977-11-03 1980-02-05 Sanyo Kiki Kabushiki Kaisha Hydraulic control apparatus
JPH076530B2 (ja) * 1986-09-27 1995-01-30 日立建機株式会社 油圧ショベルの油圧回路
KR920006520B1 (ko) * 1988-06-17 1992-08-07 가부시끼가이샤 고오베세이꼬오쇼 파우어 셔블의 유체제어기구
KR950019256A (ko) * 1993-12-30 1995-07-22 김무 스윙 가변 우선이 가능한 중장비용 유압회로
JP2892939B2 (ja) * 1994-06-28 1999-05-17 日立建機株式会社 油圧掘削機の油圧回路装置
JPH08105404A (ja) 1994-09-28 1996-04-23 Samsung Heavy Ind Co Ltd サイドバイパス流路の形成されたモノブロックコントロール弁
CN1123373A (zh) * 1994-09-28 1996-05-29 三星重工业(株) 设有边侧旁通油路的整体组合控制阀
JPH08105405A (ja) 1994-09-29 1996-04-23 Samsung Heavy Ind Co Ltd 再生流路を持つモノブロックのコントロール弁
KR100226281B1 (ko) * 1994-09-30 1999-10-15 토니헬샴 가변우선장치
US5560387A (en) * 1994-12-08 1996-10-01 Caterpillar Inc. Hydraulic flow priority system
KR0185493B1 (ko) * 1996-03-30 1999-04-01 토니헬샴 중장비용 유량 합류장치
JP3501902B2 (ja) 1996-06-28 2004-03-02 コベルコ建機株式会社 建設機械の制御回路
JP3550260B2 (ja) * 1996-09-30 2004-08-04 コベルコ建機株式会社 アクチュエータ作動特性制御装置
US5940997A (en) * 1997-09-05 1999-08-24 Hitachi Construction Machinery Co., Ltd. Hydraulic circuit system for hydraulic working machine
JP3943779B2 (ja) * 1999-01-19 2007-07-11 日立建機株式会社 土木・建設機械の油圧駆動装置
JP3491600B2 (ja) * 2000-04-13 2004-01-26 コベルコ建機株式会社 建設機械の油圧制御回路
JP3557167B2 (ja) * 2000-11-20 2004-08-25 新キャタピラー三菱株式会社 作業用機械における油圧回路
JP3614121B2 (ja) * 2001-08-22 2005-01-26 コベルコ建機株式会社 建設機械の油圧装置
US7155909B2 (en) * 2003-05-15 2007-01-02 Kobelco Construction Machinery Co., Ltd. Hydraulic controller for working machine
US7178333B2 (en) * 2004-03-18 2007-02-20 Kobelco Construction Machinery Co., Ltd. Hydraulic control system for hydraulic excavator
US20090025380A1 (en) * 2007-07-24 2009-01-29 Parker Hannifin Corporation, An Ohio Corporation Fixed/variable hybrid system
US8607557B2 (en) * 2009-06-22 2013-12-17 Volvo Construction Equipment Holding Sweden Ab Hydraulic control system for excavator
JP5388787B2 (ja) * 2009-10-15 2014-01-15 日立建機株式会社 作業機械の油圧システム
JP5528276B2 (ja) * 2010-09-21 2014-06-25 株式会社クボタ 作業機の油圧システム

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11257302A (ja) 1998-03-06 1999-09-21 Toshiba Mach Co Ltd 多連油圧バルブ
JPH11303809A (ja) * 1998-04-20 1999-11-02 Komatsu Ltd 油圧駆動機械のポンプ制御装置
JP2000046015A (ja) * 1998-07-28 2000-02-15 Yutani Heavy Ind Ltd 油圧回路の自己診断装置
JP2007192344A (ja) * 2006-01-20 2007-08-02 Kobelco Contstruction Machinery Ltd 作業機械の油圧制御装置

Also Published As

Publication number Publication date
CN104220763A (zh) 2014-12-17
KR101681248B1 (ko) 2016-12-12
EP2863065A4 (fr) 2015-07-22
EP2863065B1 (fr) 2018-07-25
US9932994B2 (en) 2018-04-03
CN104220763B (zh) 2018-06-29
JP2014001769A (ja) 2014-01-09
KR20140138266A (ko) 2014-12-03
US20150059331A1 (en) 2015-03-05
EP2863065A1 (fr) 2015-04-22
JP5778086B2 (ja) 2015-09-16

Similar Documents

Publication Publication Date Title
JP5778086B2 (ja) 建設機械の油圧回路及びその制御装置
JP5758348B2 (ja) 建設機械の油圧回路
JP5985276B2 (ja) 建設機械の油圧回路及びその制御装置
EP2799723B1 (fr) Système de réduction de consommation de carburant dans une excavatrice
JP5978056B2 (ja) 建設機械の油圧回路及びその制御装置
JP6453820B2 (ja) 建設機械用方向制御弁グループ
JP6763006B2 (ja) ショベル及び建設機械用方向制御弁グループ
JP5934669B2 (ja) 建設機械の油圧駆動装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13803591

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20147028304

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2013803591

Country of ref document: EP